Process for dyeing keratin fibres using a direct dye bearing a disulfide/thiol/protected thiol function and water vapour

摘要

The invention relates to a process for dyeing and/or lightening keratin fibers such as the hair, using i) at least one cationic direct dye bearing a disulfide, thiol or protected thiol function especially of formula (I) as defined in the description and ii) water vapor. The invention also relates to the use i) of at least one cationic direct dye bearing a disulfide, thiol or protected thiol function combined with ii) water vapor, for dyeing and lightening keratin fibers, and to the use of water vapor for grafting onto keratin fibers dyes bearing a disulfide, thiol or protected thiol function. The process used and the use of thiol, protected thiol or disulfide dyes combined with water vapor makes it possible especially to obtain a long-lasting coloration on keratin fibers without the use of a reducing agent and without odor.

主权项

1. A process for dyeing keratin fibers, comprising:
applying to the fibers at least one cationic direct dye chosen from cationic direct dyes comprising a disulfide function and cationic direct dyes of formula (I) comprising a protected thiol function:
A-(X)p—Csat—S—U  (I)and organic acid salts, mineral acid salts, optical isomers, geometric isomers, tautomers and solvates thereof,wherein in formula (I):
U is a radical chosen from —S —C′sat—(X′)p′-A′; A and A′, which may be identical or different, are radicals comprising at least one cationic chromophore; X and X′, which may be identical or different, are chosen from linear and branched, saturated and unsaturated divalent C1-C30 hydrocarbon-based chains, optionally interrupted and optionally terminated at at least one end with at least one divalent group chosen from —N(R)—, —N+(R)(R)—, —O—, —S—, —CO—, and —SO2— wherein R, which may be identical or different, is chosen from hydrogen C1-C4 alkyl radicals, hydroxyalkyl radicals, and aminoalkyl radicals; and aromatic and non-aromatic, saturated and unsaturated, fused and non-fused (hetero)cyclic radicals optionally comprising at least one identical or different, optionally substituted heteroatom; p and p′, which may be identical or different, are chosen from 0 and 1; Csat and C′sat, which may be identical or different, are chosen from optionally cyclic, optionally substituted linear and branched C1-C18 alkylene chains; and applying water vapor to the fibers;wherein the at least one cationic direct dye and the water vapor may be applied together or separately.